Electric-arc lamp



(No Model.) 3 SheetsSheet 1.

0. PPLUGER. ELECTRIC ARC LAMP.

No. 473,95 Patented May 3, 1892.

(No Model.) 3 SheetsSheet '2.

C. A. PFLUGER.

ELEGTRIG ARC LAMP.

No. 473,956. Patented May 3, 1892.

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0. A. PFLUGER.

ELEOTRIG ARC LAMP.

No. 473,956. Patented May 3, 1892.

UNITED STATES PATENT OFFICE.

CHARLES A. PFLUGER, OF CHICAGO, ILLINOIS, ASSIGl -OR, BY DIRECT ANDMESNE ASSIGNMENTS, TO THE STANDARD ELECTRIC COMPANY, OF

ILLINOIS.

ELECTRIC-ARC LAM P.

S'PECIFICATION forming part of Letters Patent No. 473,956, dated May 3,1892.

Application filed November 13, 1890- Serial No- 371,294. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES A. PFLUGER, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Are Lamps, of which thefollowing is a full, clear, and exact specification. My inventionrelates to are lamps, and has for its object to provide a cheap andsimple 1o lamp, and particularly to provide convenient means forconducting the current to the upper carbon and for cutting out the lamp.

My invention is illustrated in the accompanying drawings, wherein Figure1 is a side view ofthe lamp, the same being momentarily cut out. Fig. 2is a rear view of the lamp, showing more fully the circuits. Fig. 3 is adetail view of the mechanism of the lamp, the same beingin operation.

Fig. 4 is a detail of the device for conveying the current to theupper-carbon rod.

Like parts are indicated bythe same letters in all the figures.

I haveillustrated only the regulating mechanism of the lamp, as theremaining portions are so well known as not to require fullillustrations.

A is a main conductor, leading to the contact B, and thence by theconductor B through 0 the resistance B to the screw 13 When the circuitis closed by the operation of the cutout, the current passes throughsuch cut-out mechanism and by the conductor B to the c011- ductor Bthence to the binding-post Bflthence to the Wire 13 From the contact orbinding post B a shunt-conductor B leads to the coils 15 B of theshunt-magnet and thence to the conductor B From the same binding-post Bleads the conductor C to the main-circuit magnet C and thence to theframe at C This frame is insulated above and below at C and C but fromone part of itleads the conductor C to the support D, which is U-shapedin cross-section, as shown in Fig. 4:, and has the operating spring-armsD D to bear on the upper-carbon rod D and has the transverse screw-boltD, by means of which its sides may be brought together to bring thespringarms D D nearer together. The whole of this device shown in Fig. 4is pivoted to a vertical pivot D, which is journaled in the arms D Dwhich are secured to the link or hanger D The hanger D is pivoted to thelever E, at the outer end of which is secured the plunger E and thedash-pot E and the counteracting spring E and the cores E and theshunt-magnets B B It is understood of course that the lever E isbifurcated so as to carry both of the cores E E. This lever E, or theends thereof, are pivoted at the rear of the lamp at E E to the fixedframe E IVith the shunt-magnets operating it is evident that the leverEis raised and lowered, and with it the link D but since the device shownin Fig. at for the purpose of conveying the current from the frame, andhence from conductor C to the carbon-rod, is supported upon the link Dit will rise and fall with such lever E, and hence responsive to thechanges in the strength of the shunt-magnets. This link or hangerDcarries at itslower end the clutch-rod F, which is enlarged at F toencircle the carbon-rod, and is upwardlyheld at one end by the spring Fand adjustably supported at the other by the stop F G is the armature ofthe main-circuit magnet C, pivoted at G and connected by the rod G withthe stop F. This latter is pivoted on the standard F' and has the link Fpivoted to the link F, which carries the dog F provided with the tail Fand the spring F". The link F is pivoted concentric with thecircuit-closing piece F adapted to engage the contact H, from whichleads the conductor l3 and which is insulated from the binding-post Bexcept when such contact is made.

.I is the arm from the lever E, having the pin J adapted to engage thetail F on dog F.

If the parts are in the position shown in Fig. 3, the arc will be inprocess of burning, and if it have such aresistance or an impediment inthe feed as to shunt an abnormallylarge current into the shunt-magnettheywill become abnormally strong and will so far overcome the spring Eas to bear down the lever E and force down the arm J until its pin willsufficiently engage the tail F to trip the dog F from its engagementwith the enlarged upper end of the pivoted circuit-clos- I00 ing piece FThe spring F now pulls down the pin F and thus the lower end of thecircult-closer comes against the contact-plate H and short-circuits thelamp or cuts out the shunt mechanism. If the parts are now in suchcondition that they cannot work, the current will continue to flowthrough such short circuit, including the resistance B and the partswill remain substantially in the position indicated in Fig. 1. If, as isusually the case upon such short circuit being made, the parts resumetheir normal position, the carbons falling into contact, the stop F willmove on its pivot from the position shown in Fig. 3 to that shown inFig. 1 and the dog will re-engage its notch. A certain portion of thecurrent will be shunted through the main-circuit magnet C andimmediately it will lift its armature G, and thus lift the stop F intothe position shown in Fig. 3, and thus raise such dogand move thecircuit-making piece F away from the contact-plate II, and the lamp willresume its operation. As the main-circuit magnet thus lifts itsarmature, it lifts with it the link K, carrying the clutch Ii, wherebythe upper-carbon rod D is lifted to establish the arc.

I do not herein desire to dwell upon the operation of the main-circuitmagnet and sh u ntmagnets, except so far as may be necessary to anunderstanding of the operation of the device shown in Fig. 4, and thecut-out, as I have sufficiently shown and described these portions in mypatent application, Serial No. 358,983.

The use and operation of my invention, so far as the same relates to thecut-out and the conveyance of the current to the upper carbon, is asfollows: The main-circuit magnet being energized by an introduction ofthe current into the lamp, bears up its armature and at the same timetilts the stop F into the position shown in Fig. 3. The clutch Lsimultaneously engages the upper-carbonrod, lifts the same, andestablishes the arc. By so doing it comes into a horizontalposition,where it loses its grip on the carbon-rod and hence its control upon thesame. Simultaneously with this action, however, occurs the operation ofthe shunt-magnet, which controls its clutch, to feed the carbon in theusual manner. As before described, if the current becomes abnormallystrong in the shunt-magnet the dog F is tripped from its engagement withthe enlarged upper portion of the circuit-making piece F and the latteris thrown in contact with the plate H. Thereupon the current passes fromthe conductor A through the resistance-coil, thence through the plate Hto the conductor 13, and thence to the line-conductor B and the carbonsof the lamp will come together and the parts will assume the positionindicated in Fig. 1. Immediately the current will pass through themain-circuit magnet again, and it will lift its armature and bring theparts into the position shown in Fig. 3, thus breaking the cut ou t, andthe lamp will resume its operation. In the process of feeding the devicefor conducting the current from the fixed frame to the upper-carbon rodwill move with the feed clutch, as it is connected directly thereto,both being swung upon the same link or hanger, from the lever which iscontrolled by the sh nut-magnets. Thus a sliding contact with suchcarbon-rod is made, and since the contacting-arms D and D move up anddown with the rod an exceedingly-delicate feed is possible. Moreover, bypivoting these arms to the same i ertical pivot they will always bearwith equal force upon the opposite sides of the carbon-rod, and the sametension may be given by turning the transverse screw D.

It is quite evident that great changes could be made in the constructionand arrangement of this device without materially departing from thespirit of my invention, and I do not wish to be limited in theapplication of such cut-out and cu rrent-carrying devices, asI expect toapply both in lamps of greatly-different form from that herein shown.

I claim 1. In an arc lamp, a current-carrying device consisting offingers to engage the carbon-rod on opposite sides and means wherebythey may be adjustably brought together, and a vertical pivot on whichsuch device is supported, so that the fingers bear with equal pressure011 opposite sides of the carbon-rod.

2. In an arc lamp, the combination of the feeding magnet or solenoidwith a currentcarrying device independent of such feeding magnet orsolenoid and adapted to lead the current from a fixed portion to theupper-carbon rod, said device consisting of arms clasping the rod onboth sides, movably responsive to variations in the. strength of thefeeding magnet or solenoid.

3. In an arc lamp, the combination of the feeding magnet or solenoidwith a feedingclutch operated thereby and a separate current-carryin gdevice distinct from such clutch and adapted to lead the current to theuppercarbon rod, said device supported so as to be always equidistantfrom and to travel with the feeding-clutch.

CHARLES A. PFLUGER. lVitnesses:

CELESTE P. CHAPMAN, HARRIET M. DAY.

